United Airlines Mileage Plus members can earn 1,000 bonus miles per night when staying at a participating Waldorf Astoria or Conrad hotel before December 20.
In order to qualify, members must join Hilton's HHonors loyalty programme and in their profile select United Mileage Plus as their preferred double dip points and miles partner.
They must also register online at hhonors.com/luxury/united before their first stay and book their stay on any Hilton Worldwide website or central reservations.
A maximum of 5,000 miles per stay applies.
This international offer may be combined with other promotions. However, "bonus award miles, award miles and any other miles earned through non-flight activity do not count or qualify for Premier status unless expressly stated otherwise"
united.com/mileageplus, hiltonhhonors.com
Graham Smith